My interpretation is, if they were just there to plunder and scram, why would they bring their brood mother there? And describing a character and their role is "telling a story." I just flat out disagree with your "worth" comment, not much else I can say on that.
Idk if you know this, but we're agreeing on most of these points (though I wouldn't blame english for our culture's bias towards the masculine default), I just think that fish tiddies are as irrelevant to being a fish mom as a beard is on an opressive lizard dog thing.
And I'm not counting the ungendered monsters since we don't know, but I don't want to have to rely on the benefit of the doubt with "well they haven't saiiiiid that monster isn't a female" to inflate the monsterous-female count. If it's not explicitly or implicitly gendered, it's not counted into either list.
Tho it's legitimate to assume Cuchulainn is male buy default since he's named after an Irish legend (though, to the original topic, he should've been a very sexy man who is also mostly naked due to the mythical cuchulainn's story describing him as almost illegally hot)
It's my observation of what fish are. And what the sahagin (or their AU counterparts) are. They lay eggs in clutches. It's how this game world works.
Not counting on the unknown, and I'm gonna be mad if that twist gets used for "we just wanted to slap tiddies on it"
That's a really overly simplistic way to look at this. "Expecting things of fantasy races" isn't the problem. "Design shortcuts that have no functional use within the story itself" is the problem. Slapping fish tiddies on a fish mom who lays fish eggs and doesn't fish breastfeed is just as effective as slapping a pink t-shirt on her saying"♀#1♀Fish♀Mom♀" Though, I guess it isn't, because my first response to seeing her was "fish tiddies?" where if her room was decorated like some kind of horrific fish brood chamber it would be "OH GOD FISH MOM!" Like, if they were designed like the Ananta where there's obviously this line between person and animal, I'd be fine with it (in a different race 'cause having the males look like that and the females looking like mermades wouuuuld send me into a blood rage), but they aren't. That's all fish. And fish tiddies is jarring.